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Related Experiment Videos

Broken particle-hole symmetry at atomically flat a-axis YBa2Cu3O7-delta interfaces.

Bruce A Davidson1, Revaz Ramazashvili, Simon Kos

  • 1Physics Department, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. davidson@tasc.infm.it

Physical Review Letters
|September 28, 2004
PubMed
Summary

We studied quasiparticle tunneling in YBCO and DyBCO superconducting films. Results show broken particle-hole symmetry in these atomically flat superconductors, evidenced by an unexpected asymmetrical feature in tunneling conductance.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Atomically flat a-axis films of Yttrium Barium Copper Oxide (YBa2Cu3O7-delta) and Dysprosium Barium Copper Oxide (DyBa2Cu3O7-delta) are crucial for studying high-temperature superconductivity.
  • Understanding the superconductor-insulator interface is key to advancing superconducting device applications.

Purpose of the Study:

  • To investigate quasiparticle tunneling in high-quality YBCO and DyBCO films.
  • To explore the properties of the superconductor-insulator interface formed with epitaxial CaTiO3 barriers.
  • To determine if particle-hole symmetry is preserved in these optimized superconducting heterostructures.

Main Methods:

  • Epitaxial growth of junction heterostructures using oxide molecular beam epitaxy.

Related Experiment Videos

  • Optimization of growth conditions using in situ monitoring for crystalline perfection.
  • Measurement of tunneling conductance below the critical temperature (Tc).

    • Main Results:

    • Achieved unprecedented crystalline perfection at the superconductor-insulator interface.
    • Observed a large, unexpected asymmetrical feature near zero-bias in the tunneling conductance below Tc.
    • This asymmetry persisted over macroscopically large areas of the superconducting films.

    Conclusions:

    • Atomically truncated YBCO crystals exhibit intrinsically broken particle-hole symmetry.
    • The observed phenomenon provides evidence for a fundamental property of these superconducting materials at specific interfaces.
    • The findings have implications for the fundamental understanding and potential applications of high-temperature superconductors.